Improvement in stove-pipe dampers



n, A. CLE AV'ELAND Stove -Pipe Damper. Patented Sep. 3, 1872.

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UNITED STATES PATENT OFFICE.

DAVID A. OLEAVELAND, OF PROVIDENCE, RHODE ISLAND.

IMPRGVEMENT IN STOVE-PIPE DAMPERS.

Specification forming part 01' Letters Patent No. 130,979, datedSeptember 3, 1872; antedated August 27, 1872.

SPECIFICATION.

I, DAVID A. CLEAVELAND, of the city and county of Providence and Stateof Rhode Island, have invented a new and Improved Damper forSmoke-Pipes, 860., of which the following is a specification, referringby letters to the accompanying drawing forming part of the same, inwhich- Figure 1 is an elevation of my improved damper within thesmoke-pipe, showing the damper closed. Fig. 2 is a vertical section ofthe same with the damper open.

Similar letters indicate like parts in both figures.

My invention relates to the combination, with a smoke-pipe or conductor,of a hollow cone or funnel with an adjustable section or door, in such amanner that the smoke-passage is contracted to the size of the opensmall end of the cone to diminish the natural draft, and by opening themovable section or door of the cone the smoke-passage is enlarged andthe draft proportionately increased; the object being to provide acontracted central passage-way that will afford sufficient draft tomaintain combustion'without undue loss of heat, and means for enlargingand increasing the smoke-way and draft to hasten combustion.

In the drawing, 0 is the hollow cone or funnel, of cast-iron, arrangedin the smoke-pipe P of a stove or furnace, and D is the adjustablesection or door forming part of, and.

hinged at G to the outside of, the cone, and made to swing outward atthe top, and afford increased passage-way for the smoke and draft bymeans of the lever L pivoted to the stand E, with its upper endconnected by the staple N to the top of the door, and its lower endpivoted to a sliding stem, E, that extends through the side of the baseof the cone, so as to open and close the door conveniently from theoutside.

By means of the cone or funnel the passage-way in the pipe is contractedto a small round opening at the small end of the cone, which affordssufficient draft and escape for the smoke and unconsumed gases after thefire has become fully kindled, and it is desirable to restrict itsconsumption of the fuel; and when it is desirable to revive the fire, ornewly kindle the same, by means of the movable section the cone isopened and additional smoke-passage and increased draft is obtained forthe accomplishment of this result.

Having described my invention, I claim- The combination of the fixedcone or funnel O, the movable section or door D, the lever L, stand E,and sliding stem H, substantially as described, for the purposespecified.

DAVID A. OLEAVELAND.

Witnesses:

ASAHEL S. HAWKINS, IsAAo A. BRowNELL.

